Device for truing grindstones and emery-wheels



(No Model.)

O. E. W. BROWN.

DEVICE FDR-TRUING GRINDSTONES AND EMERY WHEELS. No. 275,579. Patented Apr. 10,1883.

' N. vnsni Photo-Lithographer, wilhingml'l. nu

UNITED STATES PATENT Grinch.

CHARLES E. W. BROWN, or PITTSBURG, PENNSYLVANIA.

DEVICE FOR TRUING GRINDSTONES AND EMERY-WHEELS.

SPECIFICATION forming part of Letters Patent No. 275,579, dated April 10, 1883,

Application filed September 14, 1882. (No model.)

new and useful Improvements in Grindstone and Emery-Wheel Truing Devices; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, which form part of this specification, in which- Figure 1 is a frontelevation of my improve ments. Fig.2 is a transverse vertical section at the center line.

The object of this invention is to provide means for truing grindstones and emery-wheels and for maintaining their faces square and unbroken.

The invention consists, broadly, in the combination of two grindstones or emery-wheels, mounted on parallel axes, geared to a suitable motor, and adjustable toward each other, so

that the stones grind upon each other; further, in revolving said two stones or emery-wheels so that in direction the adjacent faces revolve past each other and exert a grinding action positively; further, in revolving said stones or wheels at different rates of speed, whereby in the successive revolutions the same points will not come in contact; finally, in the combination and arrangement of devices, as hereinafter fully described and claimed.

More particularly myinvention is as follows: In thedrawin gs, A A are the respective grindstones, hung on the parallel shafts B B, revolving in boxes (1 G, which are fitted to and slide on the ways a of the'frame I). The two stones thus stand face to face, and rotate in the same vertical plane. The boxes 0 C have the respective lugs b b depending therefrom, and the frame D has two similar lugs, 0, projecting so as to stand in line with and between the lugs b b. A rod, d, having right and left handed thread at its respective ends, rotates in the lugs c as bearin gs, and screws in and cuts oil the lugs b b. A worm-wheel, e, is fixed on rod d, and collars f, on each side of wheel e, between lugs c, prevent thrust of the rod in either direction. A shaft, 9, crosses through the frame D, and carries the worms h in engagement with the wheels 0, and a hand-wheel,

i, is fixed on shaft g, so that by turning the hand-wheel the two rods 01 are similarly ro- 5 tated, and the boxes 0 0 moved toward or from each other, and with them the shafts B B and stones A A. Upon shafts B B, at one side of frame D, I fix the gear-wheels J J, wheel J having one tooth less than wheel J. A box, K, is arranged in the slides L on frame D, so as to move vertically therein. Box K carries the fixed pin M, upon which revolves the sleeve N, to which I key or fix the large gear 0 and pulley P. Two radius-bars,m,are 6 respectively pivoted to the sliding box K and to the boxes 0 G, as shown, so that as the stones AA become worn the journal M N will be moved exactly in accordance with the adjustment of the boxes (J C, so as to preserve 7c the relative gearing positions of the wheels OJ andOJ. In'use,everv morning the stones A A are set so that all high points on both are successively brought into contact, and in a few minutes the two grind each other perfectly true and flat, when they are left until they become uneven again, the stones in the meantime not touching each other. Thus in a few moments daily the stones may be kept in excellentcondition without troubleorfurther 8o attention.

Pulleys and belts may be used to gear the stones, instead of the toothed wheels shown.

The invention is,of course, applicable to emery or corundum wheels, and grinding-wheels of any other abrasive material. To lubricate I cut a passage, n,in pin M, leading out to the periphery thereof, and attach an up wardly-turned pipe, terminating in an oil-cup, p, as shown.

I am aware that it is not new, broadly, to true the surfaces of two grinding-wheels by causing them to revolve with their adjacent surfaces in contact.

I claim 1. The combination of two grinding-wheels 5 mounted upon parallel shafts upon a suitable frame, adjustable toward one another, and geared directly to a pinion upon a common driving-shaft, whereby the said grindingwheels may be brought into contact and caused I oo to revolve with their adjacent faces in opposite directions.

2. In a device for truing grindstones or emery-wheels, two grinding-wheels on parallel shafts connected directly to a common drivingwheel, and simultaneously adjustable from a single shaft by intermediate mechanism, substantially as described.

5 3. The combination of two grinding-wheels,

revolving in opposite directions, with an intermediate adjusting device connected to both wheels, whereby the wheels mu be simultaneously adjusted toward one another, substan- Io tiully as described.

at. The combination of the grinding-wheels A A, their shaftsmnd the journal-boxes G U with the right and left screw-threaded shafts dd,gear-wheels c c,worm-wheelsh71,and shaft 15 g, substantially as described.

5. The combination of the grinding-wheels A A, boxes G 0, right and left screw-threaded shafts d (I, gear-wheels e 0, worm-wheels h la, shaft and hand-wheel I with the drivingwheel M, journaled in box K, said box being 20 connected by bars m m to the journal-boxes G G, whereby the adjustment of the grindwheels will operate to move the drive-wheel, substantially as described.

In testimony that I claim the foregoing as 25 my own I have hereto affixed my signature in presence of two witnesses.

CHARLES E. W. BROWN.

Witnesses:

'l. J. MGTIGHE, '1. J. PATTERSON. 

